Description of feature/enhancement

Context
When selecting students from a drop-down, there may be many students. If I know the recipient in advance, I would like to quickly type the name from the options and get the selection.

Problem
Currently, the code-base supports for searching only if I type the start of the name.
The problem is when I'm trying to search for a surname, or for example in the screenshot, their first names are prefixed with the section / team names. This makes the search essentially useless.

Being able to search with some sort of substring of the name (all possible substrings, or substrings separated by spaces) will help improve the submission user experience.